created: 08/15/00; revised: 10/28/00, 07/27/03, 07/25/09

As discussed in chapter one, 3D computer graphics consists of two activities: (1) Creating an imaginary world inside a computer, and (2) producing two dimensional images of that world from various viewpoints.

Producing a 2D image from a 3D image is an example of **projection**.
This chapter discusses the fundamental notions of projection.
The advanced topics are left for your graphics text book.

- Projections in general.
- Projecting one vector onto another.
- Example vector projections in 2D.
- Example vector projections in 3D.

How many 2D pictures can be produced from one 3D model?